Every modern browser includes a feature, at setup, to import bookmarks/favorites from another browser. Firefox certainly does.
I haven't used a manual export from the old browser and import to the new in a very long time except when someone has been using different browsers for different sets of sites. Even then, it was only on the browser(s) not chosen for automatic import of bookmarks where this is necessary.
Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363
Tolerance is the positive and cordial effort to understand another's beliefs, practices, and habits without necessarily sharing or accepting them.
~ Joshua Liebman